Machine for drilling, tapping, and inserting stops in a pipe



Aug. 4, 1953 N. E. DICKASON MACHINE FOR DRILLING, TAPPING. AND INSERTINGSTOPS IN A PIPE 2 Sheets-Sheet 1 Filed Jan. 2'7, 1950 attorney Aug. 4,1953 N. E. DICKASON 2,647,419

MACHINE FOR DRILLING, TAPPING. AND INSERTING STOPS IN A PIPE Filed Jan.27, 1950 2 Sheets-Sheet 2 4 Ha .3. 54 54 3 55 52b 0 G O Q Q 0 Q o 7 70 6e g o 0 0 Zinnentor Q 9 A/oLAA/ ED/c/(Anm/ o 00 I 2/ I operator mustshut down the water main.

Patented Aug. 4, 1953 MACHINE FOR DRILLING, TAPPING, AND INSERTING STOPSIN A PIPE Nolan E. Dickason, Erie, Pa., assignor to Hays ManufacturingCompany, Erie, Pa., a corporation of Pennsylvania Application January27, 1950, Serial No. 140,924

2 Claims.

This invention relates generally to a machine for drilling a hole,tapping same, and threadably engaging a threaded member with the tappedhole and more particularly to such a machine for use in disposing a stopcock into the wall of a pipe or water main under pressure.

Machines of this character, made in accordance with the teachings of theprior art and with which I am familiar, must be taken apart after thedrilling and threading of a hole in a pipe in order to insert a stopcook or other threaded member therein. The ratchet wrenches applied tothese prior devices are a considerable distance from the pipe or mainand a long lever arm is formed which tends to cause rotation of thedevice on the pipe. If the mandrel in these prior devices does notrelease from the stop cook, the In my device, the machine is strippedoff of the mandrel and a wrench can be placed directly on the stop.Because of the short length of chain around the pipes in these priordevices, they are unstably mounted and provide a minimum of support forthe machine. It has been necessary to tap holes substantially verticallywith these prior devices, especially where accuracy must be obtained.The locking chain is only adjustable and detachable from one side inthese prior devices and it is difiicult to tighten or release them.

In my device, the machine can be stripped olT I of the mandrel therebypermitting easy removal of the mandrel and in the event that the mandreldoes not threadably release from the stop, a wrench may be placeddirectly on the stop. My machine is closer to the pipe thereby forming ashort lever arm between the pipe and the point of application of aratchet wrench. This minimizes any possibility of the machine rotatingon the pipe. The supporting chain is carried up to a point high abovethe pipe near where the pulling is done, thereby lessening anypossibility of rotation of my machine on the pipe. With the use of mymachine, holes may be tapped at any angle. My chain is detachable fromboth sides and it may be adjusted from either side by double threadedmembers which tighten and release the chain at twice thespeed as withthe use of a single threaded member. I can vary the length of my chain.I have a simple release for my chain. If, by mistake, a cock is leftopen, it is exposed when my machine is stripped from the mandrelengaging the cock so that it may be closed prior to the time it does anydamage. This is not true of prior devices. The engaging parts of mydevice such as sleeve bearings are 2 easily removable and replaceable,thereby extending the life thereof indefinitely.

It is, accordingly, an object of my invention to overcome the above andother defects in machines for drilling and tapping a hole in a pipeunder pressure and threading a stop cock in the tapped hole and it ismore particularly an object of my invention to provide such a machinewhich is simple in construction, economical in cost, economical inmanufacture, and efficient in operation.

Another object of my invention is to provide a machine adapted to clampon a pipe and having shafts therein for holding a combined drill and tapand a stop cock respectively with means for rotating the shafts about acommon center whereby they may assume the same aligned position over aparticular point on a pipe.

Another object of my invention is to provide a ball thrust bearingassembly and novel sealing means in a machine for drilling a hole in apipe under pressure, tapping same, and threading a stop cock therein tominimize friction.

Another object of my invention is to provide a novel assembly of partsin a machine for drilling and tapping a hole in a pipe under pressure,and for inserting a stop cock therein.

Other objects of my invention will become evident from the followingdetailed description, taken in conjunction with the accompanyingdrawings, in which Fig. 1 is a transverse vertical sectional view of mynovel machine;

Fig. 2 is a top planview of my novel machine;

and

Fig. 3 is an end elevational view of my novel machine with a partthereof broken away.

Referring now to the drawings, I show in Figs. 1 to 3 inclusive acylindrical cup-shaped body I having an off-center opening 2 with adepending marginal flange 3 in the lower end thereof and stepped,annular inner shoulders 4 and 5 in the'upper end thereof. The dependingflanged portion 3 seats on a gasket 6 which in turn is seated on theinwardly extending flanged portion 1 of saddle B for seating on theouter side of a pipe. Different sizes of saddles may be utilized foradapting my machine to difierent sizes of pipe. An angularly extendingapertured boss 9 is interiorly threaded for receiving a threaded plugIll, the boss 9 providing an entrance for a lubricant and a means tocheck for pressure and also release the pressure inside of the body I.An annular, L-shaped ring I2 seats on the shoulder 5 of the body memberI. A ring gasket I3 is disposed between the shoulder 5 and the bottom ofring [2 and it engages the top of a pressure seal assembly M. Arotatable head l5 has an intermediate, outwardly extending, flangedportion [5 disposed in overlapping relationship with the lower leg ofthe L-shaped ring it. A ball thrust bearing assembly I? is juxtaposed onthe outwardly extending flanged portion N5 of the member !5 and it isheld in engagement therewith by an annular cap flange It with aperturesii} for receiving screw bolts 26} in threadable engagement with threadedapertures 22 in the outwardly extending portions 23 on the upper end ofthe body i. The ball bearing assembly l7 permits easy rotation ofengaging movable parts under pressure which forces it against the cap 58on the upper end of the body I. The cap flange l8 has an annular cutaway portion 2:? for receiving a conventional felt dirt seal or packing25. The head It has diametrically opposed, apertured depending flangesZEand 26a equi-distant from the center thereof internally threaded at 2?and 21a. The lower ends 28 and 28a of the apertured flanges 26 and 26aare flanged inwardly to seat replaceable sleeves 29 and 23a. The sleeves29 and 29a are adapted to receive the shanks 33 and 34 of a tool holdingmember 55 and a stop cock holding mandrel or member 35 respectively.Gland nuts 38 and Eta threadably engage the threaded upper ends 2? andZia of the apertured flanges 2t and 28a for engaging gland packings 3iand 35a in sealing relationship with the shanks 33 and 34. The upperends of the shanks 33 and 34 have conventional center holes adapted tobe 1v.-

engaged by the pointed end 33 of a feed screw 39 threadably engaging athreaded aperture 4-3 in an inverted, U-shaped, pivoted yoke Ill. Theyoke M is pivoted to the side of the body i by screw bolts t3. The upperends M and of the shanks 33 and M are square to engage a ratchet wrench16. The upper end 6'! of the feed screw 33 is also square to receive aratchet wrench 48.

The head 125 has a diametrically extending groove 56 for receiving thebottom portion 5! of l a handle member 52 with oppositely, outwardlyextending handles 52a and 52b. The handle 52 is secured to the head i5by cap screws 53. Spring urged stop pins 54 are carried on opposite endsof the handle 52 and are adapted to detachably engage recesses 55 in thecap flange IS.

The body i has diametrically opposite, outwardly extending, aperturedears 5'! and 53 for pivotally securing clevises 59 and 59a by means ofpins Eli and 6!. Chain holders 63 and 64 are attached to the elevises 59and 59a by chain tightening studs 65 and 66. A link chain 5? isdetachably secured to the chain holders $3 and 64. I preferably provideremovable pins ii] in some of the links in the chain 6? so that it maybe readily shortened for small sized pipes.

I will explain the operation of my device with reference to theinsertion of a stop cock into the wall of a pipe or water main underpressure; however, it should be understood that my machine may beutilized in any situation where it i desirable that two longitudinallymovable and rotatable holding chucks or tools be aligned over one pointon a surface.

In the operation of my novel machine, the saddle I8 is selected for theparticular size of pipe in which a stop cock is to be threadablyengaged. The chain 61 is then secured under the pipe and to the chainholders B3 and 6 3 as shown in Fig. 3. A combination drill and tappingtool H is then disposed in the tool holding chuck 35 and a stop cook '12is disposed in the stop cock holder 3% as shown in Fig. l. A ratchetwrench 48 is disposed over the square upper end 4 3 of the shank 33 andthe pointed end 33 of the feed screw 39 is fed into the center hole inthe upper end of the shank- 33 by means of a ratchet Wrench 58. Ratchetwrench 45 rotates the drilling and tapping tool holder 35 and ratchetwrench 48 moves it longitudinally through feed screw 39. Lubricant maybe provided for the drilling and tapping through the apertured boss 9 inthe side of the body When the hole in the pipe is bored and tapped, thetool holder 35 is rotated in a counterclockwise direction after removingthe feed screw 33 and the combination drilling and tapping tool H ismoved up into the interior of the body I so that it can be rotatedtherein. The spring urged pins 54- in the handle 52 are then drawn outof engagement with the recesses 55 and the head I5 is rotated so thatthe stop cock 72 carried by the stop cock holder 3 is in alignment withthe threaded aperture formed in the pipe at which time the spring urgedpins 54 will engage suitably spaced recesses 55 in the cap flange it.The stock cock holder 35 is then moved longitudinally until the stopcook 72 engages the tapped hole in the pipe after which it is rotatedand engaged therewith. After the stop cock i2 is threadably engaged orinserted in the threaded aperture in the pipe, the chain 5'; is releasedand the body i is pulled from the shank 34 of the stop cock holder 36.The holder 3:; is then removed from the stop cock .2. Upon rotation ofthe head !5 to its original position as shown in Fig. 1 and thedisposition of a new step cock in the stop cock holder 35, my ma chineis ready to drill and tap another hole and insert a stop cock therewith.

It will be noted that in the drilling and tap ping operation of mymachine and the operation of inserting the stop cook, the hole in thepipe is sealed from atmosphere at all times inasmuch as the saddle 3sealingly engages the pipe and all other parts are sealingly engaged.Rotation of the head I5 with the tool and stop cock holders 35 and 36 issimplified and made easy by the utilization of the ball thrust bearingassembly ill. The pressure seal assembly It prevents leakage.

It will be evident from the foregoing description that I have provided anovel machine for drilling a hole in a pipe or other vessel underpressure, tapping the hole, and then aligning a threadable member inalignment with the hole without exposing it to atmosphere and threadablyengaging it with the threaded aperture formed by the tool of themachine. I have fur ther provided a machine which has a ball thrustbearing assembly with an associated pressure seal assembly to permit aminimum resistance to the rotation thereof and to the movement of themoving parts.

Variou changes may be made in the specific embodiment of my inventionwithout departing from the spirit thereof or from the scope of theappended claims.

What I claim is:

1. A machine for drilling an aperture in a vessel, tapping same, andthreadably engaging a threaded member with the formed tapped aperturewithin a sealed body comprising a vertically extending, cylindrical bodyhaving axially spaced, annular, internal shoulders, means for sealinglyengaging the lower end of said body with a vessel, an L-shaped ringseated on the upper of said shoulders, a rotatable head having anoutwardly directed flange overlapping the lower portion of said L-shaped ring and having diametrically opposed apertures equi-distant fromthe center thereof, a ball thrust bearing assembly mounted on theoutwardly directed flange on said rotatable head and in engagement withthe inner side of said L-shaped ring, a cap flange on said bodyengageable with the upper side of said ball bearing assembly, shaftsextending through said apertures in said head and sealingly engagedtherewith, a hinged yoke on said body, a feed screw for alternatelyengaging the upper ends of said shafts to feed them longitudinally,wrench engaging means on said shafts for rotating same, means on thelower ends of said shafts for attaching a tool and a threaded memberrespectively thereto, means for rotating said head and shafts underpressure whereby they may be aligned in the same position with respectto a point on said vessel, and a sealing ring mounted on the lowerinternal shoulder in said body.

2. A machine for drilling an aperture in a vessel, tapping same, andthreadably engaging a threaded member with the formed tapped aperturewithin a sealed body comprising a vertically extending, cylindrical bodyhaving axially spaced, annular, internal shoulders, means for sealinglyengaging the lower end of said body with a vessel, an L-shaped ringseated on the upper of said shoulders, a rotatable head having anoutwardly directed flange overlapping the lower portion of said L-shapedring and having diametrically opposed apertures equi-distant from thecenter thereof, a ball thrust bearing assembly mounted on the outwardlydirected flange on said rotatable head and in engagement with the innerside of said L-shaped ring, a cap flange on said body engageable by theupper side of said ball bearing assembly, shafts extending through saidapertures in said head and sealingly engaged therewith, a hinged yoke onsaid body, means on said shafts for rotating same, means on the lowerends of said shafts for attaching tools thereto, means for rotating saidhead and shafts under pressure whereby they may be aligned in the sameposition with respect to a point on said vessel, and a sealing ringmounted on the lower internal shoulder in said body.

NOLAN E. DICKASON.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 111,474 Riley Jan. 31, 1871 284,746 Lennox Sept. 11, 1883309,085 Payne Dec. 9, 1884 549,619 Walker Nov. 12, 1895

